The mark of a truly great craftsmen is that they take something simple and mundane and make it look like a master piece. You are a truly great craftsman of the citadel post.
The idea that certain months or celestial alignments are superior for certain types of spells is as old as spell casting itself. The age of Aquarius versus the age of Ares has also been ascribed to explain certain global trends (at least as far my astrology minded former roommate claim). I am going to bet this idea came to in you a flash and was scribbled quickly into a note and then the formatting of this piece too longer than formation of the idea itself. Yet this is complete and well formatted piece. A nice bit of world building,
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though the rarely is the pacing of a story or a campaign such that 22.5 years can be passed and then the relative bonuses or weakness of that period be appreciated.